Study on non-unit transient protection principle for EHV transmission lines based on wavelet singular entropy
Study on non-unit transient protection principle for EHV transmission lines based on wavelet singular entropy
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DOI：
10.1109/pes.2009.5275613
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发表时间：
2009-07
期刊：
影响因子：
--
通讯作者：
Liu Qing;Wang Zengzing
中科院分区：
文献类型：
--
作者：
Liu Qing;Wang Zengzing
提出了一种基于小波熵概念的非单元暂态保护新方案。结合小波变换、能量熵和奇异值分解技术，利用电力系统故障暂态高频信号复杂程度的差异，分析了内部故障和外部故障时小波奇异熵的特性，构造了基于小波奇异熵的不单元暂态保护启动和跳闸判据。PSCAD/EMTDC仿真结果表明，该方案对故障类型、故障位置、故障电阻和故障起始角不敏感。保护算法简单。可以实现良好的适应性和灵敏度。
A new scheme of non-unit transient protection based on the concept of wavelet entropy is suggested. Combined with the technique of wavelet transform, energy entropy and singular value decomposition, using the difference of complexity degree of electric power system fault transient high frequency signal, the characteristic of wavelet singular entropy with internal and external fault is analyzed and the startup and trip criterion of non-unit transient protection based on wavelet singular entropy is constructed. The PSCAD/EMTDC simulation results show that this scheme is insensitive to fault type, fault location, fault resistance and fault inception angle. The protection algorithm is simple. Favorable adaptability and sensitivity can be realized.